Cromberg, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 34.3 °F (low) to 64.5 °F (high). Annual precipitation averages 43.3 Inches. Cromberg is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.5 °F | 45.3 °F | 8.04 in. |
| February | 25.1 °F | 48.7 °F | 7.26 in. |
| March | 28.5 °F | 53.5 °F | 6.47 in. |
| April | 31.8 °F | 59.5 °F | 3.68 in. |
| May | 37.7 °F | 68.4 °F | 2.21 in. |
| June | 43.6 °F | 78.4 °F | 0.8 in. |
| July | 48.8 °F | 87.2 °F | 0.17 in. |
| August | 47.1 °F | 86.5 °F | 0.15 in. |
| September | 41.4 °F | 80.7 °F | 0.57 in. |
| October | 33.6 °F | 68.1 °F | 2.16 in. |
| November | 27.6 °F | 53.4 °F | 4.01 in. |
| December | 23.4 °F | 44.0 °F | 7.76 in. |
| Annual | 34.3 °F | 64.5 °F | 43.28 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |